Visualizing weak ferromagnetic domains in multiferroic hexagonal ferrite thin film

Wenbo Wang,1 Julia A. Mundy,2 Charles M. Brooks,3 Jarrett A. Moyer,4 Megan E. Holtz,2 David A. Muller,2,5 Darrell G. Schlom,3,5 and Weida Wu1,* 1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA 2School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA 3Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA 4Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA 5Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA (Received 20 January 2017; revised manuscript received 5 April 2017; published 26 April 2017)